August 23, 20232 yr Getting this error set when I try to start the array after selecting the internal 500GB drive in this Macbook Pro 2017 Aug 22 19:37:32 UNRAID emhttpd: error: mdcmd, 4174: Invalid argument (22): write: start ERROR:NO_DATA_DISKS retval: -1 Aug 22 19:37:32 UNRAID kernel: mdcmd (31): set md_num_stripes 1280 Aug 22 19:37:32 UNRAID kernel: mdcmd (32): set md_queue_limit 80 Aug 22 19:37:32 UNRAID kernel: mdcmd (33): set md_sync_limit 5 Aug 22 19:37:32 UNRAID kernel: mdcmd (34): set md_write_method Aug 22 19:37:32 UNRAID kernel: mdcmd (35): start ERROR:NO_DATA_DISKS Aug 22 19:37:32 UNRAID kernel: md: start_array: ERROR:NO_DATA_DISKS Aug 22 19:37:32 UNRAID emhttpd: Start error
August 23, 20232 yr Community Expert Solution Assign the disk as data, not parity, there must be at least on data device assigned to the array.
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